GB2273026A - Microwavable food packaging container/pressure relieving valve mechanism - Google Patents
Microwavable food packaging container/pressure relieving valve mechanism Download PDFInfo
- Publication number
- GB2273026A GB2273026A GB9224025A GB9224025A GB2273026A GB 2273026 A GB2273026 A GB 2273026A GB 9224025 A GB9224025 A GB 9224025A GB 9224025 A GB9224025 A GB 9224025A GB 2273026 A GB2273026 A GB 2273026A
- Authority
- GB
- United Kingdom
- Prior art keywords
- container
- food
- drink
- receptacle portion
- receptacle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D51/00—Closures not otherwise provided for
- B65D51/16—Closures not otherwise provided for with means for venting air or gas
- B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
- B65D51/1638—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of an element bursting upon a predetermined pressure in the container being exceeded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
- B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
- B65D81/3453—Rigid containers, e.g. trays, bottles, boxes, cups
Abstract
An air tight container in which preserved food or drink may he heated by microwave is formed from substantially rigid or semi-rigid components. The container may be subject to microwave heating with or without the removal of a container seal 60 or lid 40 and a pressure relieving valve mechanism 50 may be provided. <IMAGE>
Description
AIR-TIGHT CONTAINER
The present invention relates to a substantially rigid or semi-rigid, air-tight container, and has particular reference to containers for storing preserved drinks, such as beverages, and preserved foods of a fluid or partially fluid nature for subsequent heating by microwave irradiation.
The use of microwave radiation to effect heating of food and drink is well-known, and many commercial and domestic kitchens include a microwave oven which is typically used for re-heating and/or de-frosting purposes. With a few exceptions, however, microwave heating is generally unsuitable for cooking raw food as opposed to merely re-heating, because microwave radiation by itself does not procure the desired amount of crisping and/or browning of many types of food.
Many solutions to this problem have been proposed in the prior art. For example United States Patent
Specifications Nos. 4230924 and 4267420 each disclose a flexible wrapping for food which is capable of being manipulated to conform at least to a portion of an article of food. The wrapping comprises a dielectric substrate which carries a relative thin film of lossy material such, for example, as aluminium on a surface of the substrate. While a major proportion of microwaves incident on the wrapping pass through the wrapping, a minor proportion interacts with the lossy material which converts the energy of the microwaves into heat to effect crisping and/or browning of the wrapped food.
United States Patent Specification No. 4190757 discloses a package for food which includes an assembly of dielectric and lossy components. The package of US 4190757 is adapted to accommodate for storage and subsequent microwave heating food of a substantially non-fluid nature such as savoury or fruit pies, sandwiches and cuts or fillets of meat or fish.
There is, however, a requirement for a container for storing drinks such, for example, as beverages and food of a fluid or partially fluid nature for extended periods of time under air-tight conditions, which container can be used to contain the drink or food during the course of microwave heating so as to obviate the requirement for decanting the drink or food into a different container or receptacle.
The applicant envisages that such a container would be particularly suitable for storing preserved beverages such as tea and coffee as well as preserved drinking soups and preserved foods such as beans or pasta in various types of sauce and custard. In particular, the applicant perceives that such a container would meet a long-felt need in the provision of "fast-food" eg. in road-side service stations as well as other self-service "fast-food" retail outlets.
Furthermore, such a container may find application outside the food industry for storing non-edible fluid materials which are required to be heated in a microwave.
According to one aspect of the present invention, therefore, there is provided a substantially rigid or semi-rigid, air-tight container adapted for storing preserved food or drink of a fluid or partially fluid nature; characterised in that said container camprises a receptacle portion formed from a substantially rigid, temperature resistant material having a low loss angle with respect to microwave radiation; wherein said preserved food or drink can be stored in said container over extended periods of time and subsequently heated in the receptacle portion by microwave heating without degradation of said material or contamination of said food or drink.
By the term "substantially rigid or semi-rigid, as used herein is meant that the container is sufficiently strong and dimensionally stable that said preserved food or drink can be stored in said container over an extended period of time, with little or no risk of the container being damaged e.g.
punctured thereby derogating from the air-tight nature of the container and allowing deterioration of said preserved food or drink. Furthermore, the rigidity of the receptacle portion allows the receptacle portion to be handled easily for heating and consuming the food or drink. It will be understood that, in accordance with the present invention, the food or drink may be heated in, and consumed directly from the receptacle portion in which the food for drink is stored. In some embodiments, the receptacle portion may be shaped ergonomically for consuming the food or drink; the receptacle portion may be shaped e.g. as a cup, mug or bowl. In one aspect the receptacle portion may comprise handle means to facilitate handling of the receptacle portion particularly after heating when the contents may be hot.
It will be understood that the present invention includes any suitable material known to a person skilled in the art, but, in one aspect, said material may be selected from polyester, polypropylene or other dielectric plastics materials, glass, ceramic, cardboard or paperboard and composite dielectric materials.
The material may have a low loss angle with respect to microwave radiation having a frequency in the range 1500 - 3500 MHz; typically the microwave radiation may have a frequency of 2000 - 3000 MHz. In one embodiment the microwave radiation may have a frequency of about 2500 MHz.
Said container may further comprise a closure portion.
Said closure portion may be detached or removed from the receptacle portion prior to or after heating.
In another aspect of the present invention there is provided a substantially rigid or semi-rigid, air-tight container for storing preserved food or drink of a fluid or semi-fluid naturem said container comprising a receptacle portion adapted for accommodating said food or drink and a closure portion therefor, characterised in that:
(i) said receptacle portion is formed from a
substantially rigid or semi-rigid temperature
resistant material having a low loss angle with
respect to microwave radiation.
(ii) sealing means is provided between the
closure portion and the receptacle portion to
render the closed container air tight, thereby
to permit the storage of said food or drink for
an extended period of time, and
(iii) pressure relief means is provided in the
closure portion and/or the receptacle portion;
the arrangement being such that when the
container and contents are heated by microwave
radiation, any excess pressure built up in the
receptacle portion is vented by the pressure
relief means, thereby negating the need to remove
the closure portion prior to heating.
The closure portion may be formed integrally with the receptacle portion. Said sealing means may comprise a region of weakness between the receptacle portion and the closure portion. In some embodiments, the closure portion may form a tear-off portion of the container. Said region of weakness may comprise a single line of air-tight partial perforations between the closure and the receptacle portion. Alternatively, the region of weakness may comprise two parallel spaced lines of weakness defining a tear-strip or elongate tear-tab. The tear-strip or tab may comprise a protruding portion constituting a "start" tab.
The closure portion may, in one aspect of the invention, be formed from the same material as said receptacle portion.
In a different aspect of the invention the closure portion may be formed separately from the receptacle portion. Said closure portion may form a screw- or press- fit with the receptacle portion. In one embodiment, the sealing means may include lipping means on the closure portion and means on the receptacle portion adapted to cooperate with said lipping means to form an air-tight seal.
In one aspect, the closure portion may comprise a metal cap or lid which must be removed prior to microwave irradiation. The metal cap may be formed of aluminium or anodized or enamelled steal.
In a different aspect, the closure portion may be formed of a non-lossy material having a low loss angle with repsect to said microwave radiation.
In yet another aspect of the invention, the closure portion may be fused to the receptacle portion to form a hermetic seal therewith.
Said sealing means may include a sealing strip or tape adapted to form an air-tight seal between the receptacle portion and the closure portion. Said strip or tape may be adapted to overlay the external surface of the container at the interface between said receptacle portion and said closure portion. In some embodiments, said strip or tape may form a shrink-fit on said container. In one aspect of the invention, the sealing strip or tape may be susceptible to physical and/or chemical degradation by microwave radiation whereby removal of the strip or tape may be facilitated by microwave irradiation.
Said material may be a composite material. In one aspect of the invention, the material may include a fluid resistant layer or lining on the inside of said receptacle, thereby to prevent seepage of penetration of said food or drink into said material. In another aspect, the material may be impregnated with a dielectric sealing or fluid-repelling material thereby to render said material resistant to said food or drink.It will be appreciated however that said sealing or fluid-repelling material must be resistant to microwave radiation to avoid contamination of the food or drink in the receptacle by leaching of the sealing material Similarly, it will be appreciated that where the material is a plastics material, said material may include a plasticizer provided that said plasticizer does not contaminate the food or drink during storage, or subsequent heating and consumption.
Typically, the pressure release means may be included in said closure portion. Said pressure release means may be selected from manually operable venting means, self-sealing venting means and rupturing membrane release means. Said manually operable means may comprise an aperture formed in said closure portion, which aperture is closed with a frangible film or sheet to form an air-tight seal. Said frangible film or sheet may be ruptured prior to heating using a sharp implement such, for example, as a knife
Alternatively, said venting means may comprise a tear-off tab which may be released by hand prior to heating to reveal or form an aperture in said closure portion.
Said self-sealing venting means may comprise a pressure release valve or nipple which operates when the pressure in said container exceeds a predetermined threshold pressure. Said rupturing membrane venting means may comprise an aperture formed in said closure portion, which aperture is sealed by a film or sheet having a predetermined tensile strength, whereby said film or sheet is caused to rupture irreversibly when the pressure acting thereon in the container exceeds said strength. In a different aspect, said rupturing membrane means may comprise a frangible film or sheet which extends across the interior of the receptacle to form a hermetic partition which divides said receptacle into a food/drink containing portion and a closed, empty portion.If and when the pressure in the food portion exceeds the pressure in the empty portion, said film or sheet may be caused to rupture thereby allowing the pressure in the food containing portion to be released into said empty portion.
In yet another aspect, the receptacle portion may be closed with a thin hermetically sealed film or sheet.
Said closure portion may overlay said film or sheet to protect the latter during storage and/or display of the container. It will be understood that said film or sheet may include pressure release means in addition to, or as an alternative, to said pressure release means in said closure portion.
It will be appreciated therefore that the present invention provides a substantially rigid or semi-rigid container which is suitable for storing preserved food and drink over an extended period of time. The container includes a receptacle portion which accommodates the food or drink and is formed of a non-lossy material so that the food or drink can be heated in the receptacle portion by microwave irradiation without having to decant the food or drink into a different container for heating. Furthermore, the heated food or drink may be consumed directly from the receptacle portion.
Typically, the container may include a closure portion which forms an air-tight seal with the receptacle portion via sealing means. The closure portion may typically be provided with pressure-release means which allows said food or drink to be heated in the receptacle portion by microwave heating without having to remove or open the closure portion, any excess pressure built-up in the container during heating being vented by said pressure release means.
Following is a description by way of example only and with reference to the accompanying drawings of methods of carrying the present invention into effect. In the drawings, Figure 1 is a perspective side view of a container in accordance with the present invention.
In Figure 1, a container (10) comprises a receptacle portion (20) and a closure portion (40) adapted to mate with the receptacle portion (20). Said receptacle and closure portions (20) (40) are each formed from a substantially rigid, heat resistant thermoplastic material which has a low loss angle with respect to microwave electromagnetic radiation having a frequency of about 2500 NHz e.g. polypropylene or polyester.
The receptacle portion (20) includes a circular base (22) and an upstanding frusto-conical wall (24) which terminates at its upper end (25) in an annular rim (26) (not shown).
The closure portion (40) comprises an annular crown (42) formed with a depending, peripheral cylindrical skirt (44) which terminates at its lower end in an annular rim (45). The internal diameter of said skirt (44) is slightly less than the external diameter of the wall (24) at said upper end (25), so that said skirt (44) forms a tight-fit with said upper end (25) when the closure portion is mated with the receptacle portion by entering said skirt (44) over the upper end of the wall (24) and pushing the closure portion (40) downwardly with respect to the receptacle portion until rim (26) abuts on the underside of crown (42).
Said annular crown (42) defines a central hole (46) which accommodates a self-sealing pressure release device (50) of the type well known to a person skilled in the art, which pressure release device (50) includes a pressure release valve or nipple (52) which operates when the pressure in the container exceeds a predetermined threshold pressure. The device (50) is secured in the hole (46) by an air-tight seal formed of microwave resistant material.
Said container (10) also comprises a sealing strip or tape (60) which is formed from an air-tight, non-lossy material. When the closure portion (40) is fitted on the receptacle portion (20), said strip or tape (60) is placed around the circumference of the container so that it overlays the lower rim of the skirt (44) and the juxtaposed portions of said skirt (44) and said wall (24). The strip or tape (60) is then subjected to a heat treatment so that it shrinks onto the surface of the container to form an air-tight seal between the closure portion (40) and the receptacle portion, and to hold the two portions together against any internal positive pressure in the container.
The container (10) also includes a handle portion (70) which is carried by the external surface of wall (24).
Said container is adapted to contain preserved drink or preserved food of a fluid or partially fluid nature. The preserved food (or drink) is charged into the receptacle portion (20) under sterile conditions, and the closure portion (40) and sealing tape or strip are then fitted successively as hereinbefore described to form a hermetic seal between the receptacle portion (20) and the closure portion (40).
As a result of the rigidity of the container, the food (or drink) can be stored in the container for an extended period of time before consumption. In order to heat the food, the whole container may be placed in a microwave over and irradiated with microwave radiation having a frequency of about 2.5 GHz for a predetermined period of time. If the pressure in the container during heating exceeds the threshold of the pressure-release device (50), the valve or nipple is automatically operated to release the pressure whereupon the pressure in the container falls back below said threshold thereby allowing said valve or nipple to close. The valve or nipple may open and close several times during the heating stage.
When said food (or drink) has reached the desired temperature for consumption, the container is removed from the microwave oven, and the sealing tape or strip (60) is removed by any convenient method e.g. cutting or tearing. Thereafter the closure portion (40) is removed by hand, and the food (or drink) may be consumed directly from the receptacle portion (20). It will be appreciated that the rigidity of the receptacle portion (20) renders it sufficiently dimensionally stable to the handled easily to consume the food or drink.
Claims (1)
- CLAIMThis invention related to a container for the containment and microwave heating of preserved foods and/or liquids.According to one aspect of the present invention, therefore, there is provided a substantially rigid or semi-rigid, air-tight container adapted for storing preserved food or drink of a fluid or partially fluid nature; characterised in that said container comprises a receptacle portion formed from a substantially rigid, temperature resistant material having a low loss angle with respect to microwave radiation; wherein said preserved food or drink can be stored in said container over extended periods of time and subsequently heated in the receptacle portion by microwave heating without degradation of said material or contamination of said food or drink.In another aspect of the present invention there is provided a substantially rigid or semi-rigid, air-tight container for storing preserved food or drink of a fluid or semi-fluid nature, said container comprising a receptacle portion adapted for accommodating said food or drink and a closure portion therefore, characterised in that: (i) said receptacle portion is formed from a substantially rigid or semi-rigid temperature resistant material having a low loss angle with respect to microwave radiation.(ii) sealing means is provided between the closure portion and the receptacle portion to render the closed container air tight, thereby to permit the storage of said food or drink for an extended period of time, and (iii) pressure relief means is provided in the closure portion and/or the receptacle portion; the arrangement being such that when the container and contents are heated by microwave radiation, any excess pressure built up in the receptacle portion is vented by the pressure relief means, thereby negating the need to remove the closure portion prior to heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9224025A GB2273026A (en) | 1992-11-16 | 1992-11-16 | Microwavable food packaging container/pressure relieving valve mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9224025A GB2273026A (en) | 1992-11-16 | 1992-11-16 | Microwavable food packaging container/pressure relieving valve mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9224025D0 GB9224025D0 (en) | 1993-01-06 |
| GB2273026A true GB2273026A (en) | 1994-06-01 |
Family
ID=10725178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9224025A Withdrawn GB2273026A (en) | 1992-11-16 | 1992-11-16 | Microwavable food packaging container/pressure relieving valve mechanism |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2273026A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0839726A1 (en) * | 1996-10-11 | 1998-05-06 | EMSA-Werke Wulf GmbH & Co. | Insulated container |
| WO2003004360A2 (en) * | 2001-07-05 | 2003-01-16 | The Best Raffaello-S.R.L. | Cardboard container with tear-off annular section |
| WO2004054400A3 (en) * | 2002-12-13 | 2004-10-14 | Oreal | Make-up processes and processes for application of a skin care product, and devices used in the implementation of such processes |
| WO2004106169A2 (en) * | 2003-05-29 | 2004-12-09 | Hubert Eric Walter | Container for pre-portioned meals and/or liquids |
| FR2871346A1 (en) * | 2004-06-14 | 2005-12-16 | Oreal | Conditioning assembly for e.g. mascara, has packaging device including applicator and container containing cosmetic product, and outer enclosure, where enclosure and container are subjected to radiation emitted by micro-wave oven |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB653023A (en) * | 1948-05-25 | 1951-05-09 | David Edward Davies | Improvements in or relating to covers for preserving jars and the like |
| GB1021596A (en) * | 1964-06-11 | 1966-03-02 | Foster Grant Co Inc | A container with a removable snap-on closure |
| GB2188520A (en) * | 1986-03-27 | 1987-09-30 | House Food Industrial Co | Sealed container for use in cooking |
| US4796776A (en) * | 1987-02-19 | 1989-01-10 | Northland Aluminum Products, Inc. | Pressure cooker for microwave ovens |
| GB2222355A (en) * | 1988-08-26 | 1990-02-28 | Courtaulds Films & Packaging | Microwavable food container |
| US4961944A (en) * | 1985-10-19 | 1990-10-09 | Gourmec Laboratory Co., Ltd. | Package for microwave oven cooking and method of use |
| EP0416759A1 (en) * | 1989-09-08 | 1991-03-13 | CEM Corporation | Ventable rupture diaphragm-protected container for heating contained materials by microwave radiation |
| EP0438080A1 (en) * | 1990-01-11 | 1991-07-24 | Matsushita Electric Industrial Co., Ltd. | A pressure cooker |
| US5039001A (en) * | 1990-06-18 | 1991-08-13 | Kraft General Foods, Inc. | Microwavable package and process |
| US5053594A (en) * | 1989-11-09 | 1991-10-01 | Rich-Seapak Processing Corporation | Cook and serve food package for the storing and heating by microwave energy of a food item |
-
1992
- 1992-11-16 GB GB9224025A patent/GB2273026A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB653023A (en) * | 1948-05-25 | 1951-05-09 | David Edward Davies | Improvements in or relating to covers for preserving jars and the like |
| GB1021596A (en) * | 1964-06-11 | 1966-03-02 | Foster Grant Co Inc | A container with a removable snap-on closure |
| US4961944A (en) * | 1985-10-19 | 1990-10-09 | Gourmec Laboratory Co., Ltd. | Package for microwave oven cooking and method of use |
| GB2188520A (en) * | 1986-03-27 | 1987-09-30 | House Food Industrial Co | Sealed container for use in cooking |
| US4796776A (en) * | 1987-02-19 | 1989-01-10 | Northland Aluminum Products, Inc. | Pressure cooker for microwave ovens |
| GB2222355A (en) * | 1988-08-26 | 1990-02-28 | Courtaulds Films & Packaging | Microwavable food container |
| EP0416759A1 (en) * | 1989-09-08 | 1991-03-13 | CEM Corporation | Ventable rupture diaphragm-protected container for heating contained materials by microwave radiation |
| US5053594A (en) * | 1989-11-09 | 1991-10-01 | Rich-Seapak Processing Corporation | Cook and serve food package for the storing and heating by microwave energy of a food item |
| EP0438080A1 (en) * | 1990-01-11 | 1991-07-24 | Matsushita Electric Industrial Co., Ltd. | A pressure cooker |
| US5039001A (en) * | 1990-06-18 | 1991-08-13 | Kraft General Foods, Inc. | Microwavable package and process |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0839726A1 (en) * | 1996-10-11 | 1998-05-06 | EMSA-Werke Wulf GmbH & Co. | Insulated container |
| WO2003004360A2 (en) * | 2001-07-05 | 2003-01-16 | The Best Raffaello-S.R.L. | Cardboard container with tear-off annular section |
| WO2003004360A3 (en) * | 2001-07-05 | 2004-03-04 | Best Raffaello S R L | Cardboard container with tear-off annular section |
| WO2004054400A3 (en) * | 2002-12-13 | 2004-10-14 | Oreal | Make-up processes and processes for application of a skin care product, and devices used in the implementation of such processes |
| WO2004106169A2 (en) * | 2003-05-29 | 2004-12-09 | Hubert Eric Walter | Container for pre-portioned meals and/or liquids |
| WO2004106169A3 (en) * | 2003-05-29 | 2005-03-31 | Hubert Eric Walter | Container for pre-portioned meals and/or liquids |
| FR2871346A1 (en) * | 2004-06-14 | 2005-12-16 | Oreal | Conditioning assembly for e.g. mascara, has packaging device including applicator and container containing cosmetic product, and outer enclosure, where enclosure and container are subjected to radiation emitted by micro-wave oven |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9224025D0 (en) | 1993-01-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |